CN116371151A - High-concentration intermittent organic exhaust pretreatment system and method - Google Patents

High-concentration intermittent organic exhaust pretreatment system and method Download PDF

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Publication number
CN116371151A
CN116371151A CN202310289341.4A CN202310289341A CN116371151A CN 116371151 A CN116371151 A CN 116371151A CN 202310289341 A CN202310289341 A CN 202310289341A CN 116371151 A CN116371151 A CN 116371151A
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tower
liquid
blowing
concentration
pipeline
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郑达
崔一凡
陆小虎
杨振亚
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Jiangsu Environmental Engineering Technology Co Ltd
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Jiangsu Environmental Engineering Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1425—Regeneration of liquid absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1487—Removing organic compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention relates to the technical field of industrial waste gas treatment, and provides a high-concentration intermittent organic exhaust pretreatment system and method. Comprises an absorption tower, a lean liquid tank, a rich liquid tank, a blowing tower and the like; the absorption tower is connected with a system air inlet main pipe, and the blowing tower is connected with a blowing machine; the tail gas main pipes of the absorption tower and the blowing tower are respectively connected with post-treatment combustion equipment; the absorption tower is connected with a lean solution tank through a lean solution supplementing pipeline, and the lean solution tank is connected with the blowing tower through a lean solution extracting pipeline; the absorption tower is connected with a rich liquid tank through a rich liquid extraction pipeline, and the rich liquid tank is connected with the blowing tower through a rich liquid supplementing pipeline. When the tail gas concentration of the absorption tower is low, reducing the lean liquid supplementing or rich liquid extracting amount of the absorption tower or starting the injection system; when the concentration of the tail gas of the blowing tower is low, the lean liquid extraction amount of the blowing tower is reduced or the blowing air quantity is increased. The system can stably maintain the concentration of the organic exhaust gas entering the after-treatment combustion equipment under intermittent and fluctuating working conditions.

Description

High-concentration intermittent organic exhaust pretreatment system and method
Technical Field
The invention belongs to the technical field of storage tank exhaust and process exhaust treatment in petrochemical industry, fine chemical industry and the like, and particularly relates to a high-concentration intermittent organic exhaust pretreatment system.
Background
The industries of petrochemical industry, fine chemical industry and the like often relate to high-concentration intermittent organic exhaust gas, and the exhaust gas generally has the characteristics of large flow and concentration fluctuation and high saturated vapor pressure. As the emission limit requirements of the existing comprehensive emission standard of the air pollution, the emission standard of the air pollutant industry and the like on the non-methane total hydrocarbon and the characteristic pollutant are increasingly strict, a combustion method is generally required to be adopted as the tail end of the waste gas treatment and the deep treatment mode, but the relevant design specifications of the waste gas combustion process (such as technical Specification of the treatment engineering of the organic waste gas of the heat storage combustion method (HJ 1093-2020) and technical Specification of the treatment engineering of the organic waste gas of the catalytic combustion method (HJ 2027-2013) require that the inlet concentration of the pollutant does not exceed 25% of the explosion lower limit of the pollutant, pretreatment measures are required to be adopted to reduce the concentration of the pollutant in the waste gas. The traditional pretreatment method comprises condensation, absorption, adsorption and the like, and can realize the function of reducing the concentration of high-concentration organic exhaust gas.
However, in the intermittent exhaust condition, when the exhaust flow rate or the organic matter concentration is low, the requirement of maintaining the sufficient combustion state of the post-treatment combustion apparatus cannot be satisfied. Because the combustion equipment is required to continuously run after being started, the combustion equipment cannot be started and stopped at any time, when the exhaust gas quantity is small or the concentration of organic matters is low, the after-treatment waste gas combustion equipment is in an idle combustion state, the consumption of the supplementary fuel is extremely large, and the equipment running cost causes huge pressure to a using unit. The technical means of pre-storing organic exhaust gas such as a gas holder has the defects of high risk degree, high operation and management requirements, large occupied area, high investment and the like, and has lower operability in practical application.
Disclosure of Invention
The invention provides a high-concentration intermittent organic exhaust pretreatment system and a high-concentration intermittent organic exhaust pretreatment method, which are used for solving the problem of large consumption of supplementary fuel caused by concentration fluctuation of organic matters in exhaust and exhaust flow fluctuation in the prior art.
In a first aspect of the invention, a high concentration intermittent organic exhaust pretreatment system is provided, comprising an absorption tower, a lean liquid tank, a rich liquid tank and a blowing tower; the absorption tower is connected with a system air inlet main pipe, and the blowing tower is connected with a blowing machine; the tail gas main pipes of the absorption tower and the blowing tower are respectively connected with post-treatment combustion equipment; an absorption liquid is arranged in the tower kettle of the absorption tower; the absorption tower is connected with a lean solution tank through a lean solution supplementing pipeline, and the lean solution tank is connected with the blowing tower through a lean solution extracting pipeline; the absorption tower is connected with a rich liquid tank through a rich liquid extraction pipeline, and the rich liquid tank is connected with the blowing tower through a rich liquid supplementing pipeline; a first gas concentration detector is arranged on the main absorption tower tail gas pipe and is interlocked with automatic regulating valves arranged on the lean solution supplementing pipeline and the rich solution extracting pipeline; and a second gas concentration detector is arranged on the tail gas pipe of the blowing tower and is interlocked with an automatic regulating valve arranged on the blowing machine and the lean liquid extraction pipeline.
Optionally, the tower bottom of the absorption tower is connected with a spraying port of the tower body through an absorption liquid circulating pump and an absorption liquid circulating pipeline; the absorption liquid circulating pipeline is connected with the rich liquid tank through a rich liquid extraction pipeline; the tower bottom of the blowing tower is connected with a spraying port of the tower body through a blowing liquid circulating pump and a blowing liquid circulating pipeline; the injection liquid circulation pipeline is connected with the lean liquid tank through a lean liquid extraction pipeline.
Optionally, the device comprises a rich liquid heater, wherein an inlet of the rich liquid heater is connected with a blowing liquid circulating pipeline, an outlet of the rich liquid heater is connected with a spraying port of a tower body of the blowing tower, and a heat regulating device of the rich liquid heater is interlocked with the second gas concentration detector.
Optionally, the rich liquid heater is a shell-and-tube heat exchanger, the hot fluid of the heat exchanger can be low-pressure steam or hot flue gas, the blowing liquid in the rich liquid heater passes through a tube side, and the hot fluid passes through a shell side; an automatic regulating valve of the hot fluid inlet pipeline or the hot fluid outlet pipeline is interlocked with the second gas concentration detector.
Optionally, a pressure transmitter and an automatic switch valve are sequentially arranged on an air inlet main pipe of the system according to the air inlet direction, and are connected with an air inlet of the absorption tower through an induced draft fan; the pressure transmitter is interlocked with an automatic switch valve and a draught fan motor.
Optionally, the lean liquid tank and the rich liquid tank are respectively connected with the fresh absorption liquid main pipe and the sewage main pipe, and are respectively provided with a liquid level control device for adjusting respective liquid inlet and liquid outlet.
Optionally, the absorption liquid is process water or an organic solvent.
In a second aspect of the present invention, a high-concentration intermittent organic exhaust gas pretreatment method is provided, which is performed based on the high-concentration intermittent organic exhaust gas pretreatment system; when the concentration of tail gas of the absorption tower is lower than a first set value, reducing the opening of an automatic regulating valve on a lean solution supplementing pipeline or a rich solution extracting pipeline; and then if the tail gas concentration of the absorption tower is still lower than a first set value, starting a blowing tower to blow; when the concentration of the tail gas of the blowing tower is lower than a second set value, the opening of an automatic regulating valve on the lean liquid extraction pipeline is reduced or the flow of a blowing machine is reduced.
Optionally, when the concentration of the tail gas of the absorption tower is higher than a first set value, increasing the opening of an automatic regulating valve on a lean solution supplementing pipeline or a rich solution extracting pipeline; when the concentration of the tail gas of the blowing tower is higher than a second set value, the opening of an automatic regulating valve on the lean liquid extraction pipeline is increased or the flow of a blowing fan is increased.
Optionally, the blowing tower is connected with a rich liquid heater for heating the blowing liquid; when the concentration of the tail gas of the blowing tower is higher or lower than the second set value, the heating power of the rich liquid heater is correspondingly reduced or increased.
The scheme shows that the pretreatment system reduces the concentration of high-concentration organic exhaust gas to the target concentration through the absorption system, and the tail gas of the absorption tower enters the exhaust gas combustion equipment for advanced treatment and then reaches the emission standard; the rich liquid which is generated in the absorption process and is enriched with pollutants in the exhaust gas is stored in a rich liquid tank. And when no exhaust gas is generated or the exhaust gas quantity is low due to the production intermittent working condition, the rich liquid in the rich liquid tank is pumped into the injection tower, pollutants in the rich liquid are injected out through the injection blower, the tail gas of the injection tower enters the exhaust gas combustion equipment for advanced treatment and then is discharged after reaching standards, and the rich liquid is purified into lean liquid and is discharged into the lean liquid tank for temporary storage and is used as absorption liquid of the absorption tower.
Compared with the traditional high-concentration intermittent organic exhaust pretreatment process, the pretreatment system can reduce the concentration of high-concentration organic exhaust, realize stable control of the concentration of pollutants entering the after-treatment combustion equipment, temporarily store part of organic pollutants in the inlet air in the absorption liquid, transfer the pollutants in the absorption liquid into the gas under the working condition that the exhaust is not generated or the exhaust quantity is low, ensure that the amount of the pollutants entering the after-treatment combustion equipment is continuous and stable, control the amount of the pollutants in the pretreatment tail gas within a more economic range through an automatic control means, reduce the consumption of supplementary fuel, and further reduce the running cost of the advanced treatment equipment. In addition, the pretreatment system has the advantages of high automation degree and simplicity in operation and maintenance.
Drawings
FIG. 1 is a schematic diagram of the tank vent pretreatment system of the present invention.
In the figure, a 1-system air inlet main pipe, a 2-induced draft fan, a 3-absorption tower air inlet pipe, a 4-absorption tower, a 5-absorption liquid circulating pump, a 6-absorption liquid circulating pipeline, a 7-lean liquid supplementing pipeline, an 8-first fresh absorption liquid supplementing pipeline, a 9-absorption tower tail gas main pipe, a 10-rich liquid extracting pipeline, a 11-lean liquid tank, a 12-lean liquid pump, a 13-lean liquid tank blow-down pipe, a 14-air filter, a 15-blowing fan, a 16-blowing tower air inlet pipe, a 17-blowing tower, a 18-blowing liquid circulating pipeline, a 19-blowing liquid circulating pump, a 20-rich liquid supplementing pipeline, a 21-second fresh absorption liquid supplementing pipeline, a 22-blowing tower tail gas pipe, a 23-lean liquid extracting pipeline, a 24-rich liquid heater, a 25-rich liquid tank, a 26-rich liquid pump, a 27-rich liquid tank blow-down pipe, a 28-hot fluid outlet pipeline, a 29-hot fluid inlet pipeline, a 30-fresh absorption liquid main pipe, a 31-sewage, a 41-first gas concentration detector and a 42-second gas concentration detector.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings and detailed description.
As shown in fig. 1, the high-concentration intermittent organic exhaust pretreatment system provided by the invention comprises an absorption tower 4, a lean solution tank 11, a rich solution tank 25 and a blowing tower 17; the absorption tower 4 is connected with the system air inlet main pipe 1, and the blowing tower 17 is connected with a blowing machine 15; the tail gas main pipes of the absorption tower 4 and the blowing tower 17 are respectively connected with the post-treatment combustion equipment.
An absorption liquid is arranged in the tower kettle of the absorption tower; the absorption tower 4 is connected with a lean solution tank 11 through a lean solution supplementing pipeline 7, and the lean solution tank 11 is connected with a blowing tower 17 through a lean solution extracting pipeline 23; the absorption tower 4 is connected to a rich liquid tank 25 through a rich liquid extraction pipe 10, and the rich liquid tank 25 is connected to the blowing tower 17 through a rich liquid replenishing pipe 20.
Specifically, the absorption liquid in the tower bottom of the absorption tower 4 absorbs the organic pollutants in the high-concentration organic exhaust gas of the system, is rich liquid, and is extracted into the rich liquid tank 25 through the rich liquid extraction pipeline 10. The rich liquid in the rich liquid tank 25 enters the tower bottom of the blowing tower 17 to be used as blowing liquid. The blowing liquid is blown in the blowing tower 17, and based on the principle of blowing off, the contaminants such as volatile organic compounds VOCs are continuously transferred from the liquid phase to the gas phase by blowing off with a blowing machine. The blowing tail gas enters the post-treatment combustion equipment. After the organic matters in the injection liquid are injected, if the organic matters are less, the organic matters are taken as lean liquid, the lean liquid is extracted from the injection tower kettle through a lean liquid extraction pipeline 23 and enters a lean liquid tank 11, and the lean liquid of the lean liquid tank 11 enters the tower kettle of the absorption tower and is taken as absorption liquid.
A first gas concentration detector 41 is arranged on the absorption tower tail gas main pipe 9, and the first gas concentration detector 41 is interlocked with automatic regulating valves arranged on the lean solution supplementing pipeline 7 and the rich solution extracting pipeline 10; a second gas concentration detector 42 is provided on the blowing tower tail gas pipe 22, and the second gas concentration detector 42 is interlocked with an automatic regulating valve provided on the lean liquid extraction pipe 23 and a motor of the blowing fan 15. The motor of the blower 15 is a variable frequency motor.
Specifically, in order to realize stable control of the gas concentration entering the post-treatment combustion equipment, a gas concentration detector is arranged on an exhaust pipe of the absorption tower and is interlocked with automatic regulating valves arranged on a lean solution supplementing pipeline 7 and a rich solution extracting pipeline 10; the tail gas pipe of the blowing tower is provided with a gas concentration detector which is interlocked with a motor of the blowing machine 15 and an automatic regulating valve arranged on the lean liquid extraction pipeline 23. The self-control measures are key measures for controlling the concentration of the gas entering the after-treatment combustion equipment.
The self-control adjusting method comprises the following steps:
when the tail gas concentration of the absorption tower 4 is lower than a first set value, reducing the opening of an automatic regulating valve on the lean solution supplementing pipeline 7 or the rich solution extracting pipeline 10; after that, if the tail gas concentration of the absorption tower 4 is still lower than the first set value, the blowing tower 17 is started to blow; when the concentration of the tail gas of the blowing tower 17 is lower than the second set value, the opening of the automatic regulating valve on the lean liquid extraction pipeline 23 is reduced or the flow of the blowing machine 15 is reduced.
When the concentration of the tail gas of the absorption tower 4 is higher than a first set value, the opening of an automatic regulating valve on the lean solution supplementing pipeline 7 or the rich solution extracting pipeline 10 is increased; when the concentration of the tail gas of the blowing tower 17 is higher than the second set value, the opening of the automatic regulating valve on the lean liquid extraction pipeline 23 is increased or the flow of the blowing fan 15 is increased.
The scheme can be seen as follows:
the invention provides a high-concentration intermittent organic exhaust pretreatment system which is suitable for treating organic exhaust with large flow and concentration fluctuation and high saturated steam pressure. The treatment system reduces the concentration of high-concentration organic exhaust gas to target concentration through an absorption system, and the tail gas of the absorption tower enters the exhaust gas combustion equipment for advanced treatment and then reaches the standard to be discharged; the rich liquid which is generated in the absorption process and is enriched with pollutants in the exhaust gas is stored in a rich liquid tank. And when no exhaust gas is generated or the exhaust gas quantity is low due to the production intermittent working condition, the rich liquid in the rich liquid tank is pumped into the injection tower, pollutants in the rich liquid are injected out through the injection blower, the tail gas of the injection tower enters the waste gas combustion equipment, the organic pollutants in the tail gas serve as fuel of the combustion equipment, the tail gas is subjected to advanced treatment and then is discharged after reaching standards, the rich liquid is purified into lean liquid, and the lean liquid is discharged into the lean liquid tank for temporary storage and serves as absorption liquid of the absorption tower.
Preferably, a pressure transmitter and an automatic switching valve are sequentially arranged on an air inlet main pipe 1 of the system according to the air inlet direction, and the pressure transmitter and the automatic switching valve are connected with an air inlet of an absorption tower 4 through an induced draft fan 2; the pressure transmitter is interlocked with the automatic switch valve and the switch of the induced draft fan 2.
Specifically, when the storage tank exhaust gas or the process exhaust gas is generated, the detection value of the pressure transmitter arranged on the system air inlet main pipe 1 is increased, the automatic switching valve and the induced draft fan 2 after the pressure transmitter is opened in an interlocking manner, and the exhaust gas is introduced into the absorption tower 4 through the absorption tower air inlet pipe 3. In some embodiments, when the exhaust gas entering the system intake main pipe 1 is provided with pressure, the induced draft fan 2 can be omitted, for example, the exhaust pressure of the ethylene oxide and propylene oxide storage tanks is generally above 0.1MPaG, and the induced draft fan 2 is not required to be pressurized under the working condition.
Preferably, in the case of piping design, the rich liquid extraction piping 10 and the lean liquid extraction piping 23 are bypass passages of circulation pipes of the absorption tower and the injection tower, respectively, and the connection between the tower and the tank is achieved by a circulation pump. Specifically: the tower bottom of the absorption tower 4 is connected with a spray port of the tower body through an absorption liquid circulating pump 5 and an absorption liquid circulating pipeline 6; the absorption liquid circulation pipeline 6 is connected with the rich liquid tank 25 through a rich liquid extraction pipeline 10; the tower bottom of the blowing tower 17 is connected with a spraying port of the tower body through a blowing liquid circulating pump 19 and a blowing liquid circulating pipeline 18; the injection liquid circulation line 18 is connected to the lean liquid tank 11 via a lean liquid extraction line 23. Preferably, a temperature transmitter is provided on the blowing liquid circulation line 18.
Preferably, the injection liquid circulation pipeline of the injection tower 17 is also connected with a rich liquid heater 24, wherein the injection liquid flows into the spray port of the tower body after being heated by the rich liquid heater 24, so as to achieve faster and more efficient gas injection. The inlet of the rich liquid heater 24 is connected with the injection liquid circulation pipeline 18, the outlet is connected with the spray port of the injection tower body, and the heat regulating device of the rich liquid heater is interlocked with the second gas concentration detector.
Preferably, the rich liquid heater 24 is a shell-and-tube heat exchanger, the hot fluid can be low-pressure steam or hot flue gas, the injection liquid in the rich liquid heater passes through a tube side, and the hot fluid passes through a shell side; a self-regulating valve on the hot fluid inlet line 29 or the hot fluid outlet line 28 is interlocked with the second gas concentration detector 42.
Specifically, the automatic regulating valve on the hot fluid inlet pipeline 29 or the hot fluid outlet pipeline 28 is used as a heat regulating device of the rich liquid heater, and parameters such as the flow rate of the hot fluid or the cold fluid are regulated by regulating modes such as pipeline opening degree control, so as to realize the regulation of the heating power of the rich liquid heater.
Preferably, the absorption liquid is process water or an organic solvent.
Specifically, the absorption liquid is comprehensively selected according to the properties and economy of the organic matters, for example, the absorption liquid can adopt process water aiming at organic exhaust gas with better water solubility; for the organic exhaust gas with poor water solubility, the absorption liquid can adopt an organic solvent with low saturated vapor pressure, such as glycol.
Preferably, the air inlet mode of the absorption tower 4 is lower inlet and upper outlet, the absorption liquid is upper inlet and lower outlet, and the flow direction of the waste gas in the tower is opposite to the flow direction of the absorption liquid, so that the gas phase and the liquid phase are fully contacted, and organic matters in the waste gas are fully absorbed and transferred into the liquid phase; the tower top is provided with a defogging layer, the tower bottom is provided with a liquid level transmitter, an overflow port and a clean discharging port, and the overflow port is connected with the clean discharging port and the sewage main pipe. Similarly, the air inlet mode of the blowing tower 17 is lower inlet and upper outlet, the blowing liquid is upper inlet and lower outlet, and the flow direction of the blowing air in the tower is opposite to the flow direction of the blowing liquid, so that the gas phase and the liquid phase are fully contacted, and the organic matters in the blowing liquid are fully blown into the gas phase; the tower top is provided with a defogging layer, the tower bottom is provided with a liquid level transmitter, an overflow port and a clean discharging port, and the overflow port is connected with the clean discharging port and the sewage main pipe.
Preferably, the motors of the induced draft fan and the blower are variable-frequency and explosion-proof motors.
Preferably, the induced draft fan is a zero leakage fan and is of a mechanical sealing structure; the induced draft fan is preferably a centrifugal fan or a Roots blower.
Preferably, the blower is of the centrifugal blower or Roots blower type.
Preferably, the gas concentration detector detects the principle of FID or FTA.
The following provides a specific embodiment in combination with the device structure, the process flow and the self-control adjusting method of the pretreatment system of the invention:
when the storage tank exhaust or the process exhaust is generated, the detection value of the pressure transmitter arranged on the system air inlet main pipe 1 is increased, the automatic switching valve and the induced draft fan 2 after the pressure transmitter is opened in an interlocking way, and the exhaust is introduced into the absorption tower 4 through the absorption tower air inlet pipe 3.
The absorption tower 4 is matched with an absorption liquid circulating pump 5 and a lean solution tank 11, the outlet of the absorption liquid circulating pump 5 is connected with the spraying port of the absorption tower 4 through an absorption liquid circulating pipeline 6, and the absorption liquid circulating pipeline 6 is provided with a bypass, namely a rich liquid extraction pipeline 10. The lean liquid tank 11 is matched with a lean liquid pump 12 for adding fresh absorption liquid to the absorption tower 4, and an outlet of the lean liquid pump 12 is connected with a liquid supplementing port of the absorption tower 4 through a lean liquid supplementing pipeline 7. After the concentration of the high-concentration organic exhaust gas is reduced by the absorption tower 4, the exhaust gas is discharged into the post-treatment combustion equipment for advanced treatment by the absorption tower exhaust gas main pipe 9. The absorption tower tail gas main pipe 9 is provided with a first gas concentration detector 41 which is interlocked with automatic regulating valves arranged on the lean solution supplementing pipeline 7 and the rich solution extracting pipeline 10.
The regulation and control method comprises the following steps: when the first gas concentration detector is lower than the set value, the opening of the automatic regulating valve on the lean solution supplementing pipeline 7 or the opening of the automatic regulating valve on the rich solution extracting pipeline 10 can be reduced in a gradient control mode. When the first gas concentration detector is higher than the set value, the opening of the automatic regulating valve on the lean solution supplementing pipeline 7 or the opening of the automatic regulating valve on the rich solution extracting pipe 10 can be increased in a gradient control mode.
When the first gas concentration detector provided in the main absorption tower tail gas pipe 9 is still lower than the set value after the control measures are taken, the injection system can be started to increase the gas concentration entering the post-treatment combustion equipment.
The blowing tower 17 is equipped with a blowing liquid circulation pump 19, a blowing fan 15, a rich liquid heater 24, a rich liquid tank 25, and the like. The inlet of the blowing machine 15 is matched with the air filter 14, and the outlet is connected with the air inlet of the blowing tower 17 through the air inlet pipe 16 of the blowing tower. The outlet of the blowing liquid circulating pump 19 is connected with the spraying port of the blowing tower 17 through a blowing liquid circulating pipeline 18 and a rich liquid heater 24, and the blowing liquid circulating pipeline 18 is provided with a bypass, namely a lean liquid extraction pipe 23. The rich liquid tank 25 is matched with a rich liquid pump 26 for adding injection liquid to the injection tower 17, and an outlet of the rich liquid pump 26 is connected with a liquid supplementing port of the injection tower 17 through a rich liquid supplementing pipeline 20. In addition, the automatic switch valve arranged on the rich liquid supplementing pipeline 20 is interlocked with the liquid level transmitter arranged on the tower kettle of the blowing tower 17, and can automatically supplement liquid for the blowing tower 17 when the liquid level of the blowing tower is low. The tail gas of the blowing tower 17 is discharged into the post-treatment combustion equipment through a tail gas pipe 22 of the blowing tower for advanced treatment, and meanwhile, the pollutant in the waste gas is used for supplementing fuel for the combustion equipment, so that the operation cost of the combustion equipment is reduced. A second gas concentration detector 42 is arranged on the tail gas pipe 22 of the blowing tower and is interlocked with an automatic regulating valve arranged on a motor of the blowing machine 15, the lean liquid extraction pipe 23 and the hot fluid inlet pipeline 29.
The adjusting method comprises the following steps: when the second gas concentration detector is lower than the set value, the gradient control mode can be adopted to sequentially reduce the opening of the automatic regulating valve on the lean liquid extraction pipe 23, increase the opening of the automatic regulating valve on the hot fluid inlet pipeline 29 and reduce the operating frequency of the motor of the blower 15. When the second gas concentration detector is higher than the set value, the gradient control mode can be adopted to sequentially increase the opening of the automatic regulating valve on the lean liquid extraction pipe 23, reduce the opening of the automatic regulating valve on the hot fluid inlet pipeline 29 and increase the operating frequency of the motor of the blower 15.
Regarding the lean liquid tank and the rich liquid tank:
the lean liquid tank 11 and the rich liquid tank 25 are respectively connected with a fresh absorption liquid main pipe 30 and a sewage main pipe 31, and the lean liquid tank 11 and the rich liquid tank 25 are respectively provided with a liquid level control device for adjusting respective liquid inlet and liquid discharge.
Specifically, the lean liquid tank 11 is connected with the fresh absorption liquid main pipe 30 through a first fresh absorption liquid supplementing pipeline 8 provided with an automatic switching valve, the lean liquid supplementing pipeline 7 is provided with a bypass, namely a lean liquid tank drain pipe 13, and the lean liquid supplementing pipeline 7 is connected with the sewage main pipe 31 through the lean liquid tank drain pipe 13 provided with the automatic switching valve; a liquid level transmitter is arranged in the lean liquid tank 11 and is interlocked with the two automatic switch valves for adjusting respective liquid inlet and liquid discharge. The liquid level transmitter alarms when the liquid level is low, and the fresh absorption liquid main pipe 30 can automatically supplement the lean liquid tank 11 with fresh absorption liquid. When the liquid level is high, the lean solution tank drain pipe 13 automatically discharges liquid.
Likewise, the rich liquid tank 25 is connected with the fresh absorption liquid main pipe 30 through a second fresh absorption liquid supplementing pipeline 21 provided with an automatic switching valve, and the rich liquid supplementing pipeline 20 is connected with the sewage main pipe through a rich liquid tank drain pipe 27 provided with an automatic switching valve; the rich liquid supplementing pipeline 20 is provided with a bypass, namely a rich liquid tank drain pipe 27, and a liquid level transmitter is arranged in the rich liquid tank 25 and is interlocked with the two automatic switching valves. The liquid can be automatically discharged to the sewage main pipe when the liquid level is high, and the liquid can be automatically replenished for the blowing tower 17 when the liquid level is low.
Based on the above specific embodiments, the working operation flow of the pretreatment system of the present invention is as follows:
the organic exhaust gas enters through the system air inlet main pipe 1 and is pressurized by the induced draft fan 2 to be led to the absorption tower 4 (when the exhaust pressure is high, the induced draft fan is not needed). The absorption tower 4 is matched with an absorption liquid circulating pump 5 and a lean solution tank 11, an absorption liquid circulating pipeline 6 is connected to an outlet of the absorption liquid circulating pump 5, the other end of the absorption liquid circulating pipeline 6 is connected with a spraying port of the absorption tower 4, the absorption liquid circulating pipeline 6 is provided with a bypass, namely a rich liquid extraction pipeline 10, and the rich liquid extraction pipeline 10 is connected with a rich liquid tank 25. The lean liquid tank 11 is matched with a lean liquid pump 12 for adding fresh absorption liquid to the absorption tower 4, and an outlet of the lean liquid pump 12 is connected with a liquid supplementing port of the absorption tower 4 through a lean liquid supplementing pipeline 7. After the concentration of the high-concentration organic exhaust gas is reduced by the absorption tower 4, the exhaust gas is discharged into the post-treatment combustion equipment for advanced treatment.
When no or only a small amount of organic exhaust gas enters the absorber tower 4, the injection system may be turned on to increase the concentration of gas entering the after-treatment combustion device. The blowing tower 17 is equipped with a blowing liquid circulation pump 19, a blowing fan 15, a rich liquid heater 24, a rich liquid tank 25, and the like. The inlet of the blowing machine 15 is matched with the air filter 14, and the outlet is connected with the air inlet of the blowing tower through the air inlet pipe 16 of the blowing tower. The outlet of the blowing liquid circulating pump 19 is connected with the spraying port of the blowing tower 17 through a rich liquid heater 24 and a blowing liquid circulating pipeline 18, the blowing liquid circulating pipeline 18 is provided with a bypass, namely a lean liquid extraction pipeline 23, and the lean liquid extraction pipeline 23 is connected with the lean liquid tank 11. The rich liquid tank 25 is matched with a rich liquid pump 26 for adding injection liquid to the injection tower 17, and an outlet of the rich liquid pump 26 is connected with a liquid supplementing port of the injection tower through a rich liquid supplementing pipeline 20. The tail gas of the blowing tower 17 is discharged into the post-treatment combustion equipment for advanced treatment, and meanwhile, the fuel is supplemented for the combustion equipment in the form of pollutants in the waste gas, so that the running cost of the combustion equipment is reduced.
When the system is stably operated, the absorption liquid circulating pump 5 and the blowing liquid circulating pump 19 are continuous operation equipment, and two parallel equipment are preferably arranged, so that the absorption liquid circulating pump and the blowing liquid circulating pump are one by one. The induced draft fan 2, the blower 15, the lean solution pump 12 and the rich solution pump 26 are intermittently operated devices.
Before the tail gas of the absorption tower 4 and the blowing tower 17 is connected to the post-treatment combustion equipment, a gas buffer device is preferably arranged, and the combustion equipment is matched with an air inlet safety control instrument, which can refer to the conventional technical means in the field, and is not in the configuration of the pretreatment system.
Examples
The main pollutant of the process exhaust of a fine chemical enterprise is ethanol, the exhaust rule is intermittent exhaust, and the total exhaust time is about 12 hours per day. The intake parameters of the exhaust gas entering the absorption tower in the embodiment of the invention are as follows: intake air flow 2000m 3 And/h, the concentration of ethanol in the inlet air is about 5-50 g/m 3 。
By controlling the operation parameters of the absorption tower, the ethanol concentration of the tail gas of the absorption tower is not more than 20g/m 3 The absorption tower plays a certain role in pretreatment. Design gas quantity of the post-treatment combustion device is 20000m 3 And/h, the final non-methane total hydrocarbon emission concentration of the waste gas is not more than 20mg/m 3 Meets the requirements of related emission standards.
When the concentration of ethanol in tail gas of the absorption tower is not more than 10g/m 3 And when the air blowing machine matched with the air blowing tower is started, the air inlet concentration of the post-treatment combustion device is improved. By controlling the operation parameters of the blowing tower, the sum of the concentration of the tail gas of the absorption tower and the concentration of the ethanol in the tail gas of the blowing tower is not more than 20g/m 3 . Through the pretreatment system, the relative stability of the inlet air concentration of the post-treatment combustion device can be realized, and the inlet air concentration is controlled in a proper range, so that the safe operation of the device is met, and the consumption of supplementary fuel can be saved. Moreover, the absorption waste liquid generated by the common absorption method can be used as the blowing liquid of the blowing tower in the embodiment, so that the zero emission of the waste water and the waste liquid is basically achieved.
The foregoing detailed description has been provided for the purposes of illustration in connection with specific embodiments and exemplary examples, but such description is not to be construed as limiting the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications and improvements may be made to the technical solution of the present application and its embodiments without departing from the spirit and scope of the present application, and these all fall within the scope of the present application.

Claims (10)

1. The high-concentration intermittent organic exhaust pretreatment system is characterized by comprising an absorption tower, a lean liquid tank, a rich liquid tank and a blowing tower; the absorption tower is connected with a system air inlet main pipe, and the blowing tower is connected with a blowing machine; the tail gas main pipes of the absorption tower and the blowing tower are respectively connected with post-treatment combustion equipment;
an absorption liquid is arranged in the tower kettle of the absorption tower; the absorption tower is connected with a lean solution tank through a lean solution supplementing pipeline, and the lean solution tank is connected with the blowing tower through a lean solution extracting pipeline; the absorption tower is connected with a rich liquid tank through a rich liquid extraction pipeline, and the rich liquid tank is connected with the blowing tower through a rich liquid supplementing pipeline;
a first gas concentration detector is arranged on the main absorption tower tail gas pipe and is interlocked with automatic regulating valves arranged on the lean solution supplementing pipeline and the rich solution extracting pipeline; and a second gas concentration detector is arranged on the tail gas pipe of the blowing tower and is interlocked with an automatic regulating valve arranged on the blowing machine and the lean liquid extraction pipeline.
2. The high-concentration intermittent organic exhaust pretreatment system according to claim 1, wherein the tower bottom of the absorption tower is connected with the spraying port of the tower body through an absorption liquid circulating pump and an absorption liquid circulating pipeline; the absorption liquid circulating pipeline is connected with the rich liquid tank through a rich liquid extraction pipeline;
the tower bottom of the blowing tower is connected with a spraying port of the tower body through a blowing liquid circulating pump and a blowing liquid circulating pipeline; the injection liquid circulation pipeline is connected with the lean liquid tank through a lean liquid extraction pipeline.
3. The high-concentration intermittent organic exhaust pretreatment system according to claim 2, comprising a rich liquid heater, wherein an inlet of the rich liquid heater is connected with a blowing liquid circulation pipeline, an outlet of the rich liquid heater is connected with a spraying port of a blowing tower body, and a heat regulating device of the rich liquid heater is interlocked with the second gas concentration detector.
4. The high-concentration intermittent organic exhaust pretreatment system according to claim 3, wherein the rich liquid heater is a shell-and-tube heat exchanger, the hot fluid of the heat exchanger is low-pressure steam or hot flue gas, the injection liquid in the rich liquid heater passes through a tube side, and the hot fluid passes through a shell side; an automatic regulating valve of the hot fluid inlet pipeline or the hot fluid outlet pipeline is interlocked with the second gas concentration detector.
5. The high-concentration intermittent organic exhaust pretreatment system according to claim 1, wherein a pressure transmitter and an automatic switching valve are sequentially arranged on an air inlet main pipe of the system according to an air inlet direction and are connected with an air inlet of an absorption tower through an induced draft fan; the pressure transmitter is interlocked with an automatic switch valve and a draught fan motor.
6. The high-concentration intermittent organic exhaust pretreatment system according to claim 1, wherein the lean liquid tank and the rich liquid tank are respectively connected with a fresh absorption liquid main pipe and a sewage main pipe, and are respectively provided with a liquid level control device for adjusting respective liquid inlet and liquid discharge.
7. The high concentration batch organic exhaust gas pretreatment system of claim 1, wherein the absorption liquid is process water or an organic solvent.
8. A high-concentration intermittent organic exhaust gas pretreatment method, characterized by being performed based on the high-concentration intermittent organic exhaust gas pretreatment system according to any one of claims 1 to 7;
when the concentration of tail gas of the absorption tower is lower than a first set value, reducing the opening of an automatic regulating valve on a lean solution supplementing pipeline or a rich solution extracting pipeline; and then if the tail gas concentration of the absorption tower is still lower than a first set value, starting a blowing tower to blow;
when the concentration of the tail gas of the blowing tower is lower than a second set value, the opening of an automatic regulating valve on the lean liquid extraction pipeline is reduced or the flow of a blowing machine is reduced.
9. The method for pretreatment of high concentration intermittent organic exhaust gas according to claim 8, wherein when the concentration of tail gas of the absorption tower is higher than a first set value, the opening degree of the automatic adjusting valve on the lean liquid supplementing line or the rich liquid extracting line is increased; when the concentration of the tail gas of the blowing tower is higher than a second set value, the opening of an automatic regulating valve on the lean liquid extraction pipeline is increased or the flow of a blowing fan is increased.
10. The method for pretreating high-concentration intermittent organic exhaust gas according to claim 8, wherein a rich liquid heater is connected to the blowing tower for heating the blowing liquid; when the concentration of the tail gas of the blowing tower is higher or lower than the second set value, the heating power of the rich liquid heater is correspondingly reduced or increased.
CN202310289341.4A 2023-03-22 2023-03-22 High-concentration intermittent organic exhaust pretreatment system and method Pending CN116371151A (en)

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CN202310289341.4A CN116371151A (en) 2023-03-22 2023-03-22 High-concentration intermittent organic exhaust pretreatment system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310289341.4A CN116371151A (en) 2023-03-22 2023-03-22 High-concentration intermittent organic exhaust pretreatment system and method

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Publication Number Publication Date
CN116371151A true CN116371151A (en) 2023-07-04

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Country Link
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